The Foursquare app has been improved quite a bit in the last few months, moving to a new, cleaner UI that got rid of some of the confusion. Today it is receiving another small update to improve one aspect of the app, the check-in screen. The update gives the check-in area a cleaner UI, with a simple set of toggles next to the text box to manage sharing (now how about Google+ sharing?) and a single button to mention any Foursquare friends that you're with.
If there's one area of the Foursquare app to get right, this is it. You can grab the Foursquare app from the Google Play Store link above.